By Jeff McNeil
ISBN-10: 1849512124
ISBN-13: 9781849512121
This e-book is a part of the Beginner's consultant sequence. each one bankruptcy covers the stairs for numerous projects to strategy information by means of short rationalization of what's taking place in each one activity. the reason is via a couple of questions about the subject below dialogue that may function a refresher path for you. This booklet is for those who have textual content in a single layout, and want it in one other, as fast as attainable. You don't want any adventure with textual content processing, yet you will want a few easy wisdom of Python.
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Extra resources for Python 2.6 Text Processing
Example text
The dashes in the previous screenshot indicate a missing value. This doesn't necessarily correspond to an error condition. For example, if the page is not password-protected then there will be no remote user. The dash is a common condition we'll need to handle. [ 30 ] Chapter 2 For more information on web server log formats and available data points, please see your web server documentation. html Time for action – generating transfer statistics Now, let's start our processor. Initially, we'll build enough functionality to scan our logfile as read via standard input and report files served over a given size.
You saw how to create a new instance via the virtualenv command and you also learned how to subsequently activate it using the bin/activate script. Finally, we showed you how to deactivate your environment and return to your system's default state. Have a go hero – install your own environment Now that you know how to set up your own isolated Python environment, you're encouraged to create a second one and install a collection of third-party utilities in order to get the hang of the installation process.
If you entered everything correctly, your output should be as follows. py -s What just happened? We added support for a new log input format simply by replacing the parse method of our log processor. We did this by inheriting from LogProcessor and creating a new class, overriding parse. There are no additional changes required to support an entirely new format. As long as your new LogProcessor class implements the required methods and returns the proper values, it's a piece of cake. Your LogProcessor subclass could have done something much more elaborate, such as process each line via regular expressions or handle missing elements gracefully.